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Crossover From Individual to Collective Magnetism in Dense Nanoparticle Systems: Local Anisotropy Versus Dipolar Interactions

Sánchez, Elena H. (författare)
Universidad de Castilla, La Mancha,University of Castilla, La Mancha,Univ Castilla La Mancha, Inst Reg Invest Cient Aplicada IRICA, Ciudad Real 13071, Spain.;Univ Castilla La Mancha, Dept Fis Aplicada, Ciudad Real 13071, Spain.
Vasilakaki, Marianna (författare)
National Center for Scientific Research “Demokritos”,Inst Nanosci & Nanotechnol NCSR Demokritos, Aghia Paraskevi 15310, Greece.
Lee, Su Seong (författare)
Inst Mat Res & Engn, NanoBio Lab, 31 Biopolis Way,09-01, Singapore 138669, Singapore.
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Normile, Peter S. (författare)
Universidad de Castilla, La Mancha,University of Castilla, La Mancha,Univ Castilla La Mancha, Inst Reg Invest Cient Aplicada IRICA, Ciudad Real 13071, Spain.;Univ Castilla La Mancha, Dept Fis Aplicada, Ciudad Real 13071, Spain.
Andersson-Sarning, Michael, 1973 (författare)
Uppsala universitet,Strukturkemi
Mathieu, Roland (författare)
Uppsala universitet,Fasta tillståndets fysik
López-Ortega, Alberto (författare)
Universidad Publica de Navarra,Universidad de Castilla, La Mancha,University of Castilla, La Mancha,Univ Castilla La Mancha, Inst Reg Invest Cient Aplicada IRICA, Ciudad Real 13071, Spain.;Univ Castilla La Mancha, Dept Fis Aplicada, Ciudad Real 13071, Spain.;Univ Publ Navarra, Dept Ciencias, Pamplona 31006, Spain.;Univ Publ Navarra, Inst Adv Mat & Math INAMAT2, Pamplona 31006, Spain.
Pichon, Benoit P. (författare)
Institut Universitaire de France,Université de Strasbourg,University of Strasbourg,Univ Strasbourg, Inst Phys & Chim Mat Strasbourg, CNRS, UMR 7504, F-67000 Strasbourg, France.;Inst Univ France, F-75231 Paris 05, France.
Peddis, Davide (författare)
Consiglo Nazionale Delle Richerche,Università degli Studi di Genova,University of Genoa,Univ Genoa, Dipartimento Chim & Chim Ind, Via Dodecaneso 31, I-116146 Genoa, Italy.;Ist Struct Mat CNR, I-00015 Monterotondo, RM, Italy.
Binns, Chris (författare)
Universidad de Castilla, La Mancha,University of Castilla, La Mancha,Univ Castilla La Mancha, Inst Reg Invest Cient Aplicada IRICA, Ciudad Real 13071, Spain.;Univ Castilla La Mancha, Dept Fis Aplicada, Ciudad Real 13071, Spain.
Nordblad, Per (författare)
Uppsala universitet,Fasta tillståndets fysik
Trohidou, Kalliopi (författare)
National Center for Scientific Research “Demokritos”,Inst Nanosci & Nanotechnol NCSR Demokritos, Aghia Paraskevi 15310, Greece.
Nogués, Josep (författare)
Institut Catala de Nanociencia i Nanotecnologia,Institucio Catalana de Recerca i Estudis Avancats (ICREA),Catalan Institution for Research and Advanced Studies (ICREA),ICREA, Pg Lluis Co 23, Barcelona 08010, Spain.;CSIC, Catalan Inst Nanosci & Nanotechnol ICN2, Campus UAB, Barcelona 08193, Spain.;BIST, Campus UAB, Barcelona 08193, Spain.
De Toro, José A. (författare)
Universidad de Castilla, La Mancha,University of Castilla, La Mancha,Univ Castilla La Mancha, Inst Reg Invest Cient Aplicada IRICA, Ciudad Real 13071, Spain.;Univ Castilla La Mancha, Dept Fis Aplicada, Ciudad Real 13071, Spain.
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Universidad de Castilla, La Mancha Univ Castilla La Mancha, Inst Reg Invest Cient Aplicada IRICA, Ciudad Real 13071, Spain;Univ Castilla La Mancha, Dept Fis Aplicada, Ciudad Real 13071, Spain. (creator_code:org_t)
2022-06-10
2022
Engelska.
Ingår i: Small. - : Wiley. - 1613-6810 .- 1613-6829. ; 18:28
Relaterad länk:
https://research.cha... (primary) (free)
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https://doi.org/10.1...
https://uu.diva-port... (primary) (Raw object)
https://doi.org/10.1...
https://research.cha...
https://urn.kb.se/re...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • Dense systems of magnetic nanoparticles may exhibit dipolar collective behavior. However, two fundamental questions remain unsolved: i) whether the transition temperature may be affected by the particle anisotropy or it is essentially determined by the intensity of the interparticle dipolar interactions, and ii) what is the minimum ratio of dipole–dipole interaction (Edd) to nanoparticle anisotropy (KefV, anisotropy⋅volume) energies necessary to crossover from individual to collective behavior. A series of particle assemblies with similarly intense dipolar interactions but widely varying anisotropy is studied. The Kef is tuned through different degrees of cobalt-doping in maghemite nanoparticles, resulting in a variation of nearly an order of magnitude. All the bare particle compacts display collective behavior, except the one made with the highest anisotropy particles, which presents “marginal” features. Thus, a threshold of KefV/Edd ≈ 130 to suppress collective behavior is derived, in good agreement with Monte Carlo simulations. This translates into a crossover value of ≈1.7 for the easily accessible parameter TMAX(interacting)/TMAX(non-interacting) (ratio of the peak temperatures of the zero-field-cooled magnetization curves of interacting and dilute particle systems), which is successfully tested against the literature to predict the individual-like/collective behavior of any given interacting particle assembly comprising relatively uniform particles.

Ämnesord

NATURVETENSKAP  -- Kemi -- Fysikalisk kemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Physical Chemistry (hsv//eng)
NATURVETENSKAP  -- Kemi -- Materialkemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Materials Chemistry (hsv//eng)
NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Nyckelord

magnetic anisotropy
dipolar interactions
superspin glass
magnetic nanoparticles

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